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--- vendor:yamaha:opl2 [2019/04/02 18:28]
lord_nightmare rhythm is dumped already, forgot to remove note.
+++ vendor:yamaha:opl2 [2019/04/07 23:46]
lord_nightmare fix formatting
@@ Line 37: / Line 37: @@
 	|\------- ?
 	\-------- ?
+</code>
+=== YM2413 D0/D1 debug state ===
+from Nuke.YKT's notes at https://pastebin.com/H5s4WQQ8 :
+<code>
+YM2413 test data output format(!!not verified on hardware!!).
+/CS = 0
+/WE = 1
+A0  = 0
+D0 and D1 serially output test data with internal clock rate
+Internal clock rate is MCLK/4
+Clock 0  1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16 17
+D0:   P8 P7 P6 P5 P4 P3 P2 P1 P0 E6 E5 E4 E2 E1 E0 0  0  0
+D1:   C8 C7 C6 C5 C4 C3 C2 C1 C0 0  0  0  0  0  0  0  0  0
+Px - Operator 0 phase generator output LSB bits
+Ex - Operator 17 envelope generator output
+Cx - Channel 6(?) output
 </code>